AMD confirms that just one of the two chiplets for the Ryzen 9 7950X3D and 7900X3D has a 3DV Cache.

With availability set for February 2023, AMD today introduced its new Ryzen 7000X3D high-end desktop processors. You can read more about them in our previous post. We detected an oddity in the cache sizes of the 12-core 7900X3D and 16-core 7950X3D throughout our coverage. The dual-CCD 7900X3D and 7950X3D were shown with total caches of 140 MB and 144 MB, respectively, when they should have been 204 MB or 208 MB, as opposed to the 8-core, single-CCD 7800X3D’s 104 MB total cache (L2+L3), which equates to 1 MB L2 cache per core and 96 MB of L3 cache (32 MB on-die + 64

In our earlier article, we looked into two scenarios: the first, in which the 3DV cache is present on both CCDs but has been reduced in size for some reason; the second, more absurd scenario, in which only one of the two CCDs has stacked 3DV cache and the other is a typical planar CCD with only the on-die 32 MB L3 cache. It turns out that the latter hypothesis is accurate! Only one of the two CCDs in the dual-CCD 7000X3D processors is depicted having the L3D (L3 cache die) stacked on top in AMD’s high-resolution graphics. Even real-world images of the older “Zen 3” 3DV cache CCDs from the 5800X3D or EPYC “Milan-X” CPUs demonstrate how unique 3DV cache CCDs look, with separating lines between the structural substrates and L3D over the areas of the CCD that house the CPU cores. These renderings only show one of the two CCDs having these lines painted on it.